Switchboard for telephones.



PATE'NTED SEPT. 22, 1903. G. F. ARCHER.

- SWITGHBOARD' FOB; TELEPHONES.

APPLICATION FILED mm. 4. 1903.

2 SHEETS-SHEET 1.

H0 MODEL.

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PATENTED SEPT. 22, 1903. G. P. ARCHER.

SWITGHBOARD FOR TELBPHONES. I )APFLIGATION FILED rm. 4. 1903.

no MODEL.

2 SHEETS-SHEET 2.

W/YNESSES 5 AFTORNEYS.

UNITED STATES GEORGE ARCHER,

' Patented September 22, 1903.

OF NEW- YORK, N. Y.

SWITOHBOARD FOR TELEPHONES.

SPEGIFICATEON formingpart of Letters Patent No. 739,636,.dated September 22, 1903.

Application filed February 4, 1903; Serial No. 141,805. (llo model.)

' to produce animproved switchboard for use with intercommunicating telephonesystems. Reference is to be had to the accompanying drawings, forming a part of this specification,

in which similar characters of reference indicate corresponding parts in all the figures.

Figure l'is a front elevation of one of my switehboards in use. Fig. 2 is a horizontal section upon the line 2 2 of Fig. 1 looking in the direction of the arrow. Figs. 3 and4are sections practically identical with that shown in Fig. 2, but showing certain movable parts as occupying relatively different positions. Fig. 5 is a perspective view of. the lockingplate for maintaining certain contacts closed, as hereinafter described. Fig. 6 is a diagram showing the wiring of an intercommunicab ing system as used with my invention. Fig. 7 isa sectional view of one form of my switch-- board.

Within the casingl the locking-plate 2 is pivotally mounted upon the bearings 3 4 by means of a hinge-rod 3*;whereby said lockingplate is free to rock within certain limits upon the hinge-rod 3 as acenter. This plateis provided with a chamferedend 5 and with a bevel or angular edge 6,-as indicated more particularly in Fig. 1. A spring 7 normally holds the locking-plate in its extreme position to the right.

Mounted upon a block 8 of insulating mate: rial are spring-tongues 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18, arranged in two rows parallel with each other, as shown. Each of these tongues is provided with straight and bent portions 9 9", as indicated in Figs. 1, 2, 3, and 4. The bent portion 9 is free to pass into a recess 9, made in the casing for that purpose. The several plates 1415 16 17 18 are preferably connected together bya panel 18, integral therewith, as shown in Fig. 6. A contact-plate 20 is mounted adjacentto each of the tongues 14, 15, 16, 17, and 18. A number of metallic pins 22 are provided with heads 21 and with push-buttons 22, whereby the tongues 9 10 11 12 13 maybe forced toward the respective tongues 14, 15, 16, 17, and 18, the arrangement being such that a still greater pressure upon one of the push-buttons 22 will force the corresponding tongues 14, 15, 16, 17, or 18 against the contact plate 20, as will be understood by in spection of Figs. 2, 3, and 4.

The receiver 23 normally hangs upon. the switch-hook 24 in the usual manner. This switch-hook is provided with a boss 25, which engages the 'chamfered end 5 of the plate 2, so as to cause the plate 2 to rock slightly to the left when the telephone hangs upon the hook. The hook, 24 is pivotally mounted at 26 and is provided with a' bead 27 and with an integral arm 28, which carries a contactboss 29.

Mounted upon a plate 30 and insulated therefrom is a leaf-spring 31, a contact member 32, provided with a contact-bead 35, and

spring-contact ,members 33 and 34. The

spring-contact members 33 34 are arranged as shown in Fig. 1, so that the movement'of the boss 29 to the left causes the engagement of the boss 29 with the contact member 34,whereas the movement of the boss 29 to the right makes electrical connection between both contact members 32 and 33. If desired, the leaf-spring may have the shape shown at 31 in Fig. 6. Each bell 36 is connected by a wire 36 with the contact member 34, above de scribed. The contact-batteries are shown at 37 the transmitters, at 38, the primary windin'gs at 39, and the secondary windings at 40, these parts being of the usual construction.

My preferred form of switchboard is shown in Fig. 7 and is very much like the form already described. The main diiference lies in the fact that in Fig. 7 the plate 58, corresponding to the plate 2 in Figs. 1 to 4, is pivoted at its center and is doubleacting, being provided with twobevels located,respectively, at its top and bottom. When this form of switchboard is employed, the wire 75 (seeFig.

6, lower left-hand corner) is connected withplates 55 56 instead of with plate 20, as in Figs. -1 to 4, and wires 76 76 are connected with springs 44 50 instead of with springs 10. The general course of the circuit is the same whether the switchboard used be the one shown in Fig. 7 or in Figs. 1 to 4. By depressing the button 46 or 46 the springtongue 44 or 50 rocks the plate which now holds down the spring-tongue which rocked it, thereby completing a metallic circuit from the plate 56 or 55, through the spring or 51, pin 49 or 54, to tongue 44 or 50, this circuit corresponding to the circuit indicated in Fig. 4 from plate 20 to spring 9.

Mounted upon" an insulating-block 42 (see Fig. 7) are the spring-tongues 44 45, the tongues 44 being depressed by means of pushbuttons 46 and provided with bent and straight portions 48 47 and also provided with contact-pins 49. Disposed oppositely to the insulating-block 42 is another insulatingblock 43, provided with spring-tongues 50 51," the tongues 50 being provided with respective bent and straight portions 52 53 and also with contact-pins 54. The spring-tongues 45 and 51 when depressed are free to engage different portions 56 of the contact-plate 57. The contact-pins 49 for the tongues 50 are capped withpush-buttOns 46, whereby the tongues 50 may be depressed. In this instance the rocking plate 58 is provided with beveled or angular surfaces 59 60, is centrally mounted upon the hinge-rod 61, and is double-acting.

The battery 71 (see Fig. 6) is used for ringing only and is connected by a wire 72 with the common return 73. This battery is also connected by a short wire 73 with the junction 74, to which are connected the wires 75 and 77. From the spring-tongues 9 and 10 wires 76 and 76 are connected, respectively,

with the springs 31 at other stations. I The stations are otherwise connected by means of the wires 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, and 87.

The operation of my invention is as follows: 1

The several receivers being upon the hooks in the usual manner, suppose that the subscriber at the station marked A in Fig.6 wishes to ring up either of the subscribers B or C. To ring up B, he depresses the tongue 9 by means of its appropriate push-button, being sure to apply snfficient pressure to carry the tongue 14 into electrical communication with the contact-plate 20. The following circuit is thus established: battery 71, wire 7 3, junction 74, wire 7 5, contact-plate 20, contact member 14, contact-pin 22, contact-tongue 9, wire 76, wire 84, spring 31, switch-hook 24, boss 29, spring-contact 34, wire 36, bell 36, common return 73, wire 72, back to the battery 71. If A wishes to ring up 0, he depresses the contact-spring 10, thereby establishing the following circuit: battery 71, wire 73, junction 74, wire 75, contact-plate 20, contact-pin 22, contact-tongue 10,wires 76, spring 31, switchhook 24, spring-contact 34, wire 36, bell 36, commonreturn 73, and wire 72, back to the battery 71. These ringing-circuits are only completed momentarily, for the reason that as soon as the finger-pressure is relaxed the contact members 14 15 16 17 18 by their own elasticity are moved out of engagement with the contact-plate 20. As will be seen in Fig. 4, however, the electrical connection, while broken as between the contact-tongue 14 and the contact-plate 20, remains closed as between the contact-tongue 9, pin 22, and contact-tongue 14. It will be understood that when one of the push-buttons 22" is depressed, thereby forcing one of the tongues 9, 10, 11, 12, or 13 toward the base of the casing, the tongue thus depressed snaps upon the angular edge 6 of the locking-plate 2, which looks the same securely in position, as indicated more particularly in Fig. 4. If another pushbutton 22 is now pressed by one of the subscribers, one of the tongues 9 to 13 is disengaged from the locking-plate, while another of these tongues engages the same. In other words, by pressing the push-button 22 in any desired manner the electrical connection is shifted,so that as onetalking-circuitis opened another is closed, the extra pressure being only applied when it is desired to ring. If subscriber B desires to ring up subscriber A, he depresses the tongue 9 by means of its appropriate push-button, thereby completing the following circuit: battery 71, wire 73, junction 74, wires 77 78, contact-plate 20, pin 22, tongue 9, wires 79 80, spring 31, switchhook 24, spring-contact 34, wire 36*, bell 36, wires 73 72, back to battery 71. If subscriber B desires to ring up subscriber 0, he depresses the tongue 10 thereby establishing the following circuitz battery 71, wires 77 78, contact-plate 20, pin 22, tongue 10 wires 81 76, spring 31, switch-hook 24, spring-con tact 34, wire 36, bell 36, and wires 73 72, back to the battery 71. subscribers A and B. After the pressure of the finger isirelaxed the ringing ceases, for the reason that the spring-tongue 14, 15, 16, 17, or 18 opens the battery-circuit,butleaves the talking-circuit closed, as above-stated. Suppose, for instance, that subscriber A has rung up subscriber B and that the latter has answered. The talking-circuit is now established, both switch-hooks of course being raised into their uppermost positions because of the weight of the receivers being removed therefrom. Thetalking-circuitmaybetraced as follows: secondary winding 40 of station A, spring-contact 33, contact-bead 35, springcontact 32, wire 85, panel 18, (the contacttongue 14 not being connected with the contact-plate 20,) pin 22, tongue 9, wires 76 84, spring 31", switch-hook 24, contact-boss 29, spring-contact 33, secondary winding 40 of station B, wire 88, receiver 23, wire 7 3, and re ceiver 23 and 7 3, back to the secondary winding 40 at station A. In a similar way each of the other talking-circuits may be traced.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a switchboard for telephones, the com- Similarly subscriber O can ring bination of a rocking member provided with oppositely-disposed bevels, springcontacts oppositely disposed relatively to said. rocking member and provided with members for engaging said bevels, thereby closing said contacts, and mechanism, controllable at will, for causing said rocking member to release said contacts.

2. In aswitchboard for telephones,the combination of a rocking member provided with oppositely-disposed bevels, contacts disposed upon opposite sides of said rocking member and provided with claw membersfor engaging said bevels and thereby closing said contacts, and a plurality of push-buttons con-' nected separately with said contacts for closing the same.

3. In a switchboard for telephones, the combination of a rocking member provided with oppositely-disposed bevels, contacts disposed upon opposite sides of said rocking member and provided with a member for engaging said bevels, thereby closing said contacts, and means, controllable at will, for forcing said members individually into engagement with said bevels.

4. In a switchboard for telephones,the combination of a contactplate connected with a bell-circuit, a contact member movable relatively to said contact-plate andfree to make and break contact therewith, a second contact member movable relatively to said first mentioned contact member and connected with said bell-circuit,mechanism,controllable at will, for forcing said contact membersinto electrical engagement with each other and with the plate, thereby energizing said ringing-circuit, and an additional circuit con.-

nected with said contact members and opened and closed thereby.

5. In a switchboard for telephones,the combination of a contact-plate connected with a bell-circuit, a contact member movable relatively to said contact-plate and free to engage the same, a second contact member movable relatively. to said first-mentioned contact member and connected with said ringing-circuit, a plurality of separate push-pins for forcing said members into electrical engagement with each other and the plate, thereby energizing said bell-circuit, and an additional circuit connected with said contact members and opened and closed thereby.

6. In a switchboard for telephones,the com bination of a contact-plate connected with a normally open bell-circuit, a contact member movable relatively to said contact-plate and free to engage and disengage the same, said contact member being connected with a normally open talking-circuit, and a second contact member movable relatively to said firstmentioned contact member and free to engage and disengage the same, said second contact member being connected with said bell-circuit and also with said talking-circuit, the arrangement being such that said bell-circuit may be momentarily closed through said contact-plate and said contact members, and said talking-circuit may be temporarily closed through said contact members alone.

7. In a switchboard for telephones,the combination of a contact-plate connected with a normally open bell-circuit, a contact member movable relatively to said contact-plate and free to engage and disengage the same, said contact member being connected with a normally open talking-circuit, a second contact member movable relatively to said first-mentioned contact member and free to engage and disengage the same, said second contact member being connected with said bell-circuit and also with said talking-circuit, a switch-hook, contacts actuated thereby, and connected respectively with said bell and talking circuits, and a movable member connected with said switch-hook and controlled thereby, for actuating both of said contactmembers.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

v GEORGE F. ARCHER.

Witnesses:

WALTON HARRISON,

EVERARD BOLTON MARSHALL. 

